I dont understand, with my eyes the picture quality on my rock64 is much better than Odroid C2. Do you use some special settings?

But i will also say i am not an expert, do you have any tips? I have tried these different commands in the config. On both Rockchip(Rock64) and amlogic(Odroid C2) on Libreelec and Coreelec. And the 422,8 bit was the best if i remember correct on my LG55

echo '444,10bit' > /sys/class/amhdmitx/amhdmitx0/attr

echo '444,8bit' > /sys/class/amhdmitx/amhdmitx0/attr

echo '422,10bit' > /sys/class/amhdmitx/amhdmitx0/attr

echo '422,8bit' > /sys/class/amhdmitx/amhdmitx0/attr

Display More

YCbCr 4:2:2, 4:4:4 is the color space, not the range. All movies are in YUV 4:2:0 limited (16-235), not RGB full.

Be aware that i have no previous versions of Kodi eg Jarvis / Krypton that can run on LE for Rockchip so my comparison in video quality is all based on Rock64 Leia against S905 boxes with Krypton and Leia.

I've had a conversation with Ray the previous LE Leia developer who confirmed he notices the difference as well.

I strongly advise anyone wanting to try a Rockchip box to buy an SBC with uniform hardware and firmware that is being tested by developers.

You buy some cheap chinese Rockchip box and you can ignore my observations.

The screenshots from the identical movie frame or the raw hdmi capture are the only ways to compare the PQ objectively. There should be no difference. I think, you are using a wrong color space on the Rockchip device.